Shed Roof Pitch Angle

Three important considerations for building a shed roof roof pitch.

Shed roof pitch angle.

In roofing it is expressed in inches of vertical rise over inches of horizontal run. This means that for every horizontal run of 12 you need at least 3 of rise. Roof pitch refers to the slope which the rafter creates. Simply put pitch is expressed as rise over run just as the grade is simply this fraction expressed as a percentage.

Read more about roof pitch at wikipedia. Common roof pitches and equivalent grade degree and radian angles. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. Most roof s have a pitch in the 4 12 to 9 12 range.

Having a steeper pitched roof allows for more space in a shed loft. As stated in the video speed squares have useful markings on them from 0 to 12. The roof pitch measures the steepness of your shed roof and typically takes values from 1 to 12. The loft space would be much larger with a roof pitch of 45 degrees.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Therefore if your roof rises 4 inches over the course of 12 inches of horizontal run then your roof pitch is 4 12. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. This image shows a relatively shallow roof pitch of 15 degrees.

Use a pitch of more than ten degrees for more efficient rain protection. A pitch of 10 degrees or less is typically regarded as a flat roof. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. One thing you never want to do when designing your roof is build one with a pitch lower than 3 12.

Now your rafter is going to a little longer than half the span of your shed since it is at an angle. In the case of a shed roof a layer of roofing felt usually offsets the porosity of the wood. As you can see the size of wood depends on the span of your shed. Roof pitch degree table.

Remember that pitch is calculated as the height or rise of a roof pitch over 12 inches of horizontal run. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.